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Add initial support for offscreen rendering (#30767)

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* Offscreen rendering

* shared memory case never actually rendered to backbuffer

* fix compile errors (in theory) when gl crate feature disabled

* update doc comments

* remove dark CentralPanel border covering edges of viewport

* clear to transparent, to avoid pink artifacts

* fix mouse input for browser being consumed by egui

* avoid destroying OpenGL resources unless resizing window

* clean up compositing::gl

* fix flickering around edges after resizing window

* unset invalidate_last_render_target after invalidating

* fix incorrect DRAW_FRAMEBUFFER name when blitting

* bind the widget surface fbo before painting egui

* make composite_specific_target take CompositeTarget, not Option

* compositing: remove cargo feature “gl”

* capitalise FBO in bind log message

Co-authored-by: Martin Robinson <mrobinson@igalia.com>

* capitalise FBO in drop log message

Co-authored-by: Martin Robinson <mrobinson@igalia.com>

* rename RenderTargetInfo fields and use OnceCell for next field

* rename RenderTargetInfo.read to read_back_from_gpu

* document servo_framebuffer_id in Minibrowser::update

* rename needs_fbo to use_offscreen_framebuffer

* capitalise FBO in unbind log message

* clarify the purpose of Minibrowser::on_event

* fix unused_must_use warning

* reduce nesting in Minibrowser::update

* use implicit format argument in panic

* store Minibrowser.widget_surface_fbo as glow type

* explain why servo_framebuffer_id is None in first call site

* rename output_framebuffer_id to offscreen_framebuffer_id

---------

Co-authored-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Delan Azabani 2023-12-13 10:49:25 +08:00 • committed by GitHub
parent 97e6c72f57
commit 17f3c45d4f
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13 changed files with 498 additions and 273 deletions
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6
components/compositing/Cargo.toml
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@ -13,18 +13,18 @@ path = "lib.rs"
[features]
default = []
gl = ["gleam", "pixels"]
multiview = []
[dependencies]
canvas = { path = "../canvas" }
cfg-if = { workspace = true }
compositing_traits = { workspace = true }
crossbeam-channel = { workspace = true }
embedder_traits = { workspace = true }
euclid = { workspace = true }
fnv = { workspace = true }
gfx_traits = { workspace = true }
gleam = { workspace = true, optional = true }
gleam = { workspace = true }
image = { workspace = true }
ipc-channel = { workspace = true }
keyboard-types = { workspace = true }
@ -33,7 +33,7 @@ log = { workspace = true }
msg = { workspace = true }
net_traits = { workspace = true }
num-traits = { workspace = true }
pixels = { path = "../pixels", optional = true }
pixels = { path = "../pixels" }
profile_traits = { workspace = true }
script_traits = { workspace = true }
servo_config = { path = "../config" }